Identify the correct statement about the cell wall: MCQ with Answer and Explanation

Explanation:
The Munch hypothesis, or mass flow hypothesis, explains the movement of sugars (primarily sucrose) through the phloem. It proposes that sugars are actively loaded into the phloem at the source (e.g., leaves), which lowers the water potential and causes water to enter from the xylem by osmosis. This creates a high turgor pressure. At the sink (e.g., roots, fruits), sugars are unloaded, increasing water potential, and water leaves the phloem, creating a low turgor pressure. The bulk flow of sap is driven by this turgor pressure gradient from source to sink.

Explanation:
The endocrine islets of Langerhans in the pancreas contain alpha cells that secrete glucagon and beta cells that secrete insulin, which regulate blood glucose. The liver stores and releases glucose, the spleen filters blood, the kidneys excrete waste. The pancreas also has exocrine functions secreting digestive enzymes.

Explanation:
The ureters are two muscular tubes that propel urine from the renal pelvis of each kidney to the urinary bladder via peristaltic contractions. Urethra exits bladder, renal pelvis and calyces are within the kidney.